Engineered For Your Success

HTS Decanter®
for sludge

HTS = Highest dry solids content

The centrifuge for dewatering sewage sludge

The Flottweg HTS Decanter® is a specialized machine for drying out sewage sludge, which is the solid material left over from treating wastewater. "Dry solids content" refers to the amount of solid material remaining after most of the water has been removed. This decanter is known for its high performance, using less energy and fewer additives to achieve better results. Compared to traditional methods, the HTS Decanter® increases the amount of dry material, which can lead to an 80% reduction in sludge volume and save about 8% in disposal costs. It's a highly automated system, which means it can adjust to changes in the sludge and continue to operate with minimal manual intervention, making it a cost-effective solution for wastewater facilities.

The transportation and disposal of the sewage sludge accounts for a large proportion sewage treatment plant costs. The lower the sludge volume, the lower the cost of transportation and disposal. High-performance in sludge dewatering is the decisive criterion. With a Flottweg HTS Decanter® the highest possible dry solids content is achieved in dewatered sludge, thus continuously saving transport and disposal costs.

Over 50 years of experience in the dewatering of sewage sludge and ongoing development form the basis of the Flottweg HTS Decanter®. This experience combined with references from all over the world makes Flottweg one of the leading suppliers of mechanical separation technology. The HTS Decanter® impresses with its performance, efficiency and high economic benefits.

Used for sludge dewatering


The process for dewatering sewage sludge

Dewatering the digested sewage sludge from the digestion tower reduces the sludge volume. Learn more about dewatering and sludge treatment.


Efficient dewatering of waterworks sludge

Waterworks sludge is produced during the cleaning and treatment of drinking water. The sludge is dewatered in advance in order to save on transportation and disposal costs. You can find more information here.

How the Flottweg HTS decanter® functions

The digested sludge is pumped from the digestion tower into the sludge centrifuge.This dewaters the digested sludge from 2 - 6% dry solids to 25 - 35%.Dewatering in the centrifuge is achieved by means of centrifugal force.

The Flottweg HTS decanter® is adapted to the specific characteristics of the sewage sludge.The centrifuge is suitable both for the dewatering of digested sludge and for the direct dewatering of excess sludge.

Product features


The Flottweg HTS decanter® was specially designed for sludge dewatering.The energy efficient and high-performance Flottweg Simp Drive®, along with the continuously optimized geometry of this decanter centrifuge, ensure dry solids values that are several percentage points higher than those reached with other machines.If the DS value can be increased from 23% to 25%, this means that the sludge volume is reduced by about 80% for sewage treatment plants.This also reduces the costs for transportation and disposal by around 8%.In addition to the highest possible dry solids content and highest dewatering performance, the sludge centrifuge also scores in terms of both electricity and polymer consumption.

  • highest dry solids content
  • minimal power consumption
  • minimal polymer requirement

Cost saving

Since the centrifuge consumes less polymer and electricity, operating costs are reduced.In addition to the energy-efficient Simp Drive®, waste water treatment plants equipped with Recuvane® can save a further 20% energy. Decanter centrifuges do not require consumables such as filter media or filter cloths, which further reduces the cost of operating the plant.

  • energy savings of 20% thanks to Flottweg Recuvane®
  • low polymer and energy consumption for lower operating costs
  • consumables such as filter media, filter cloths etc. are not necessary


Centrifuge spare parts and wear parts can be easily exchanged on site, as well as accident prevention checks (acc. UVV). This saves the operator time and money. Highly effective wear protection ensures that the centrifuge has a long service life.

  • highly effective wear protection
  • Easy replacement of spare and wear parts on site
  • Accident prevention checks (acc. UVV) are carried out on site


Since Flottweg HTS decanters can be operated continuously and automatically, personnel costs are reduced to a minimum. During operation, the sludge centrifuge can be automatically adapted to variable inlet and operating conditions by the PLC or via remote monitoring. A cleaning cycle during the operating phase is also dispensed with. The dewatering centrifuge is managed by a control module - equipped with the InGo User Interface. InGo was awarded the German Design Award 2018 for its ease of use. The operator interface shows all important parameters at a glance and permits simple control and automation of the system. During operation, our HTS decanters can be automatically adapted to variable inlet and operating conditions by SPS or remote monitoring.

  • continuous and automatic operation
  • automatic adaptation to variable feed and operating conditions during operation
  • no cleaning cycle during the operating phase
  • Flottweg InGo for easy control of the system

Efficient dewatering equipment combined with competent service

The raccionamiento Bosques de Natura waste water treatment plant in Tijuana, Mexico, treats waste water from 7,200 households.

It uses a Flottweg C-series HTS decanter to dewater the accruing sewage sludge®.Learn more in this video.

More about the Flottweg HTS decanter®


The Flottweg C-series

Our HTS decanters for sludge dewatering are C-series decanter centrifuges. A series specially tailored to the needs of sewage treatment plants.


Fully in line with expectations

The dewatering of the digested sludge at the Bühl waste water treatment plant is carried out by a Flottweg C-series decanter centrifuge. Learn more.


In use at the Nordhausen waste water treatment plant

Two Flottweg C5E decanters type HTS dewater the digested sludge in the Nordhausen waste water treatment plant.


Would you like to learn more about our HTS decanter for sludge dewatering?

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